Hey dude, what fault code does it report??? Get a multimeter and probe back from the blue wire under the dash (single clip, next too fan speed controller) You can short out the 2 wires to by-pass the pressure switch to check for clutch engagement. The switch is usually located next too the thermostatic valve on the passenger side firewall.
EB1 3.9L MPI Falcon Wagon with converted T5 / Pacemaker & 2.5" Redback sports exhaust / 2" lowered blocks at the rear, Kings lows up front / ED Tickford Head and Cam / K&N panel filter with XH intake Snorkel / Full EL Fairmont interior with woodgrain
89 EA1 3.9L TBI Falcon Sedan with 3 speed auto / currently being upgraded...